Family Group Sheet| FATHER | | Jacob Vierstra | | REF # | | 2974; | | | | MOTHER | | Tjitske Piers Koopmans | | BIRTH | 7 November 1831 | | | REF # | | 2106; | | FATHER | Pier Piers Koopmans | | MOTHER | Riemke Wybes Cnossen |
| | | CHILDREN | | 1. | Pier Vierstra MALE | | | BIRTH | 25 February 1857 | Wymbritsradeel | | REF # | | 2975; |
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